And it is imagined by many that the operations of the common mind can be by no means compared with these processes, and that they have to be acquired by a sort of special training.

 

要点：句子的框架是 And it is imagined … that…, and that …。这是典型的句型It + is + p. p. （过去分词）+ that clause。It是形式主语，句子真正的主语是两个并列的that引导的主语从句，由连词and 连接。operation 此处不能译成“操作”，根据上下文应译成“活动”，这里的processes 要译成“思维过程”，而不能简单地理解成“过程”。

译文：许多人认为，普通人的思维活动根本无法与科学家的思维过程相比，认为这些思维过程必须经过某种专门训练才能掌握。